Answer:
Lithograph
Explanation:
Limestone is used in lithography.
Was: Wilhelm Valentiner was born at Karlsruhe (Baden), and studied at Heidelberg under Henry Thode, and in the Netherlands with Cornelis Hofstede de Groot and with Abraham Bredius
Why: In 1906 he published his dissertation on Rembrandt that he started in 1904: Rembrandt auf der Lateinschule.
Answer:
domestication of plants and dogs